﻿using System;
namespace Velocity4Net.Runtime.Res.Loader
{

    /*
     * Licensed to the Apache Software Foundation (ASF) under one
     * or more contributor license agreements.  See the NOTICE file
     * distributed with this work for additional information
     * regarding copyright ownership.  The ASF licenses this file
     * to you under the Apache License, Version 2.0 (the
     * "License"); you may not use this file except in compliance
     * with the License.  You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing,
     * software distributed under the License is distributed on an
     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     * KIND, either express or implied.  See the License for the
     * specific language governing permissions and limitations
     * under the License.
     */





    /**
     * Factory to grab a template loader.
     *
     * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
     * @version $Id: ResourceLoaderFactory.java 1780307 2017-01-26 01:57:00Z cbrisson $
     */
    public class ResourceLoaderFactory
{
    /**
     * Gets the loader specified in the configuration file.
     * @param rs
     * @param loaderClassName
     * @return TemplateLoader
     */
    public static ResourceLoader getLoader(RuntimeServices rs, String loaderClassName)
    {
        ResourceLoader loader = null;

        try
        {
            loader = (ResourceLoader) ClassUtils.getNewInstance( loaderClassName );

            rs.getLog().Debug("ResourceLoader instantiated: {}", loader.GetType().Name);

            return loader;
        }
        // The ugly three strike again: ClassNotFoundException,IllegalAccessException,InstantiationException
        catch(Exception e)
        {
            String msg = "Problem instantiating the template loader: "+loaderClassName+"." + System.lineSeparator() +
                "Look at your properties file and make sure the" + System.lineSeparator() +
                "name of the template loader is correct.";
            rs.getLog().Error(msg, e);
            throw new VelocityException(msg, e);
        }
    }
}
}